Display Panel Pixel Boosting to Reduce Data-Line Voltage Drops
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Solution Overview
Problem
Color electronic papers require high voltage data signals for color display, leading to significant voltage drops and increased power consumption due to current resistance, which is inefficient and wasteful.
Innovation Solution
Incorporating a boosting unit in the pixel circuit to increase the voltage of data signals before they reach the gate or electrode of the drive transistor, reducing the required voltage on the data signal line and minimizing IR drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high voltage data signals are used for color display, then display performance is improved, but power consumption increases and voltage drops occur on data signal lines
Solution Approach 1:
The pixel circuit is segmented into multiple functional units including a drive transistor, boosting unit, storage capacitor, and switching transistors. The boosting unit is further divided into sub-units that independently manage voltage multiplication and signal transmission, allowing high voltage to be generated locally rather than transmitted across the entire display, thereby reducing power consumption and voltage drops on data signal lines
Solution Approach 2:
The boosting unit performs preliminary voltage multiplication on the data signal before it reaches the drive transistor. By pre-boosting the voltage at the pixel circuit level rather than relying on high voltage transmission from the source, the system achieves the necessary voltage levels for color display while minimizing power consumption and voltage drops on the data signal lines
2Illumination intensity
If high voltage data signals are transmitted over data signal lines, then color display is achieved, but voltage drops (IR drops) increase on the lines
Solution Approach 1:
The voltage boosting function is segmented and distributed to individual pixel circuits rather than being centralized. Each pixel circuit contains its own boosting unit that independently multiplies the data signal voltage, eliminating the need for high voltage transmission over long data signal lines and thereby preventing voltage drops and improving voltage stability
Solution Approach 2:
The boosting unit acts as an intermediary between the low-voltage data signal line and the high-voltage drive transistor gate. It receives the data signal at a safe low voltage, multiplies it locally, and then applies the boosted voltage to the drive transistor, serving as a buffer that prevents high voltage from propagating through the data signal lines and causing voltage drops
3Reliability
If voltage is increased at the transistor gate for proper operation, then device functionality is maintained, but power consumption increases
Solution Approach 1:
The boosting unit performs preliminary voltage multiplication on the data signal before it reaches the drive transistor gate. This localized voltage boosting ensures the transistor receives the necessary high voltage for proper operation while the data signal lines themselves carry only low-voltage signals, thereby maintaining device functionality without increasing overall power consumption
Solution Approach 2:
High voltage is generated locally at each pixel circuit's drive transistor gate through the boosting unit, rather than being transmitted from a centralized source. This local voltage generation ensures each transistor receives the necessary voltage for operation while minimizing the power consumption and voltage drops associated with long-distance high voltage transmission
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces power consumption and voltage drops on data signal lines while maintaining the necessary voltage levels at the transistor gates and electrodes, enhancing efficiency and reducing power usage.
Implementation Method 1
The boosting unit is used for raising the voltage input from the first terminal of the boosting unit and outputting the raised voltage from the second terminal of the boosting unit
Implementation Method 2
A display principle of a color electronic paper is that color electrophoretic particles in an electrophoretic display layer are driven by an electric field so that the color electrophoretic particles are arranged in a particular manner to display a required color image
Data Source
AI summary
Provided are a display panel, a driving method thereof and a display device. A pixel circuit in the display panel includes a drive transistor and a boosting unit. A first electrode of the drive transistor is connected to a pixel electrode. A first terminal of the boosting unit is connected to a first data signal line. The first data signal line receives a first data signal. A second terminal of the boosting unit is connected to a gate of the drive transistor, or a second terminal of the boosting unit is connected to a second electrode of the drive transistor. In the display panel, the driving method thereof and the display device, the first data signal is boosted by the boosting unit, the boosted first data signal is output to the gate or the second electrode of the drive transistor.